REFLECTOR: Parking brake

[Rene Dugas]

I do the same with angle al. The parking brake has only helped me when  
solo parking on a slope. Engaged it gives me time to chock and tie.  
And when departing. I don't trust hydraulics to not slowly leak down  
so the parking brake for me is very temporary but useful.

Rene' Dugas, MD
Sent from my iPhone3G

On Jan 25, 2009, at 6:05 PM, "Laurence Coen" <lwcoen at hotmail.com> wrote:

> Scott,
>
> I don't have a parking brake on my Velocity but I do use chocks and  
> tie it
> down if it's on the ramp over night.  I made my chocks from 1.5"  
> aluminum
> angle about 3" long.  I have 3 pair and use them when ever I'm not  
> in the
> hanger.  If I'm away from home I also carry my own tie downs.  I've  
> been to
> airports that have rotten ropes that wouldn't keep a small dog from  
> running
> off.  My tie downs are cargo straps that have a hook on each end and a
> buckle that allows snuggling them up with a pull on the free end.
>
> Larry Coen
> N136LC
>
>
> --------------------------------------------------
> From: "Scott Derrick" <scott at tnstaafl.net>
> Sent: Sunday, January 25, 2009 8:28 AM
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Subject: Re: REFLECTOR: Parking brake
>
>> I've been flying for 3,000 + hours and never used a parking brake.
>>
>> granted I've never flown a tail wheel aircraft which I've been told
>> really needs one because it will roll into the wind at the slightest
>> breeze.
>>
>> Scott
>>
>> Chuck Jensen wrote:
>>> David,
>>>
>>> A parking brake does not come standard, by it's highly recommended.
>>> Matco (Aircraft Spruce) make an inexpensive dependable brake that  
>>> can be
>>> actuated with a little push-pull cable.  You plumb your lines into  
>>> it and
>>> when it is set on 'brake', actuating the brakes will pressurize  
>>> the line
>>> from the Matco valve to the brakes and hold pressure.  Or, you can
>>> actuate the brakes and then shut the Matco valve.
>>>
>>> At one time parking brakes were discouraged; it was thought if the  
>>> brakes
>>> were pressured and locked, and later in the day it warmed up, that  
>>> it
>>> might over-pressurize the brakes.  Great theory but it's not a  
>>> problem in
>>> practice.  I can set my brake and come back a week later and they  
>>> are
>>> still locked.
>>>
>>> Hint.  Set up your cable so that pushing the knob in releases the  
>>> brake
>>> and pulling it engages the check valve.  If you reverse it and you  
>>> happen
>>> to bump the knob in while in flight, then when you actuate the  
>>> brakes on
>>> landing they will stay locked up....not good.
>>>
>>> Chuck Jensen
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: reflector-bounces at tvbf.org [mailto:reflector- 
>>> bounces at tvbf.org]On
>>> Behalf Of David Ullman
>>> Sent: Saturday, January 24, 2009 11:58 AM
>>> To: reflector at tvbf.org
>>> Subject: Re: REFLECTOR: Parking brake
>>>
>>>
>>> I was flying my friends Grumman Tiger the other day and inquired  
>>> how the
>>> parking brake works.  Since the Grumman has a castoring noise  
>>> wheel and
>>> is
>>> steered with hydraulic toe brakes, this seemed a good question as  
>>> I am
>>> now
>>> plumbing the brakes on my Velocity.  It appears that when you pull  
>>> the
>>> parking brake knob, you are locking the hydraulic pressure on the  
>>> brakes.
>>> So, to apply the parking brakes, you apply both toe brakes, and  
>>> then pull
>>> the knob, hydraulically locking them.
>>>
>>> I don't recall seeing this capability in my Velocity kit nor  
>>> hearing it
>>> discussed on this site.  Anyone done this?  If so where did you  
>>> get the
>>> knob/valve assembly, to do this?
>>>
>>> David G. Ullman PhD ME
>>> Robust Decisions
>>> ullman at robustdecisions.com
>>> 541-754-3609
>>>
>>>
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